I would cruise some Jeep forums and see what they say. After real quick lookin, I see things like "for s 4.0 they are good but not for much stronger". And "they're garbage". Not my opinion, as I have none. Just what I found in 30 seconds.
Just a thought... I have one and really shifts nice, but I'm not a fan of wheeling here in the mountains with a manual. Autos make life so much easier. But, that means I'll have one layin' around and thought I might put it in the duster.